*{
    padding:0;
    margin: 0;
    box-sizing: border-box;
}
.header{
    background: #5ab3df;
}
 .container{
    width: 870px;
    margin: auto;
}
.header .container:after,
.nav:after,.main .container,.main .download{
    display: table;
    clear: both;
    content: "";
}
.nav{
    padding-top: 11px;
    padding-bottom: 11px;
}
.nav-left,.nav-center,.nav-right{
    width: 33.333333%;
    float: left;
}
.nav-left{
    height: 56px;
}
.nav-center{
    text-align: center;
}
.nav-right{
    text-align: right;
}
.nav-right a{
    color: #ffffff;
    font-size: 12px;
    font-weight: bold;
    text-decoration: none;
}
.nav  a img{
    display: none;
}
.header .col{
    float: left;
    width: 50%;
}
.banner{
    color: #ffffff;
    padding-top: 60px;
}
.banner p{
   font-weight: bold;
}
.banner h1{
    font-weight: 300;
    margin-bottom: 25px;
    font-size: 36px;
}
.banner a{
    background-color: #2996cc;
    padding: 15px 53px;
    font-weight: bold;
    text-decoration: none;
    color: #ffffff;
    font-size: 12px;
    display: inline-block;
    border-radius: 2px;
    transition: 0.5s;
}
.banner a:hover{
    background-color: #1882b7;
}
.banner img{
    display: block;
    width: 100%;
    text-align: center;
}
.main  .container img{
    margin-bottom: 10px;
    margin-top: 60px;
}
.main .container .col{
    float: left;
    width: 25%;
    text-align: center;
}
.main  .container h3{
    margin-bottom: 10px;
    font-size: 14px;
}
.main .container .col p{
    font-size: 14px;
    color: #657082;
    text-align: center;
    width: 190px;
    display: inline-block;
}
.main .container{
    padding-bottom: 65px;
}
.download{
    border-top: 1px solid #e0e0e0;
    text-align: center;
    padding-top: 65px;
    padding-bottom: 65px;
    width: 441px;
    margin: auto;
}
.download h2{
    margin-bottom: 20px;
}
.download p{
    margin-bottom: 35px;
}
.download a{
    display: inline-block;
}
.download img{
    margin-bottom:0;
}
.footer{
    background: #1b2126;
    color: #6a777d;
    padding-top: 60px;
    padding-bottom: 60px;
    font-family: 微软雅黑;
}
/*--*/
@media (max-width: 600px) {
    .container{
        width: 100%;
    }
    .header .nav-right span{
        display: none;
    }
    .banner .col{
        width: 100%;
        text-align: center;
    }
    .banner a{
        margin-bottom: 30px;
    }
    .banner img{
        width: 80%;
    }
     .download{
         width: 100%;
     }
    .main .container .col{
        width: 100%;
    }
    .nav a img{
        display: inline-block;
        margin-right: 30px;
    }

}
